4 Answers

I suggest you knocked something off the board or used too much heat or damaged the connector. Look for missing components, balls of solder which do not belong, and/or any type of visible damage.

Next look at the schematics and troubleshoot touch circuit.

EDIT:

@touchwireless in the red circle most to the right in your picture, there seems to be a small component, possibly a resistor bridging two capacitors C3106 and C3108. Those 2 caps are on an important line shooting out from a touch IC. Remove that component and see if that solves it. Unless it is an artifact from the picture...

Here, that small guy in the middle of this circle, the only vertically positioned component:

It should, so that you be careful. If you apply unnecessary amounts of heat to remove the shields, you kill the phone. Practice with scrap iPhone 6 boards first. They are a special breed when it comes to shield removal.